“trick of the trade”别理解成“贸易中的把戏”，其正确的含义是（某一行业或活动的）绝招，绝活，门道，诀窍。

【例句】
You'll get better at taking dictation—you're a receptionist now, and it's a trick of the trade.
你会在听写方面做的更好--你现在是一名接待员，这是一个绝活。

When you're a pediatrician, being able to stay calm while dealing with panicked parents is a trick of the trade.
当你是一名儿科医生时，在面对惊慌失措的父母时能够保持冷静也是一个诀窍。